Luna ODiSI 6 User manual

User’s Guide │ODiSI 6

ODiSI 6
ODiSI 6 User’s Guide
Page i
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released into the environment. Please contact your local waste
authority for instructions on proper recycling of the electronic
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Optical Distributed Sensor Interrogator Model ODiSI 6:
User’s Guide ODiSI 6 Software
© 2020
Luna Innovations Inc.
3155 State Street
Blacksburg, VA 24060
Phone: [phone]
Fax: [phone]
E-mail: solu[email protected]m
Web: www.lunainc.com

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Table of Contents
1 Glossary.................................................................................................................................. 5
2 Safety...................................................................................................................................... 7
3 System Overview.................................................................................................................... 7
ODiSI Instrument Specifications....................................................................................... 8
Hardware and Physical Setup..........................................................................................10
Assembly.........................................................................................................................10
4 Software Overview.................................................................................................................12
Operational Parameters...................................................................................................12
Manage the Sensor Repository .......................................................................................13
View and Evaluate Sensor Status....................................................................................13
Set Up the ODiSI for Data Logging..................................................................................13
Run a Test.......................................................................................................................13
View Test Data................................................................................................................14
5 Software Quick Start Guide....................................................................................................14
Operational Parameters...................................................................................................14
Installing a Sensor...........................................................................................................15
View and Evaluate Sensor Status....................................................................................16
Set Up the ODiSI for Data Logging..................................................................................19
Run a Test.......................................................................................................................21
View Test Data................................................................................................................24
6 Using the ODiSI 6 Software ...................................................................................................28
Operational Parameters...................................................................................................28
Instrument Status......................................................................................................28
Operational Parameters............................................................................................28
Channel Status .........................................................................................................32
Example: Operational Parameters ............................................................................35
Manage Sensors .............................................................................................................36
View and Evaluate Sensor Status....................................................................................37
Sensor Tare..............................................................................................................38
Sensor Key ...............................................................................................................38
Define Gages............................................................................................................39
Plot Navigation..........................................................................................................40

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Set Up the ODiSI for Data Logging..................................................................................41
File Saving................................................................................................................41
Managing Test Data Files .........................................................................................43
Copy Test Data.........................................................................................................44
Copying Test Data TSV Files....................................................................................45
Settings Menu...........................................................................................................47
Run a Test.......................................................................................................................56
Sensor Plot ...............................................................................................................56
Gage Plot..................................................................................................................57
View Test Data................................................................................................................58
Play Back Test Data..................................................................................................58
Generate TSV File ....................................................................................................62
Manage Configuration .....................................................................................................66
Update Feature Keys.......................................................................................................68
Time Synchronization Settings ........................................................................................68
Help...............................................................................................................................69
Documentation........................................................................................................69
Send us feedback ...................................................................................................70
Update....................................................................................................................71
Language................................................................................................................72
About ......................................................................................................................73
7 ODiSI Remote Operation .......................................................................................................74
ODiSI Remote Application...............................................................................................74
Remotely Control an ODiSI.......................................................................................74
Stream in ODiSI Measurement Data.........................................................................74
ODiSI Remote-control Interface.......................................................................................75
ODiSI Remote-control Commands............................................................................75
ODiSI Controller Status.............................................................................................76
ODiSI Remote-control Workflow................................................................................78
8 ODiSI Measurement Streaming Protocol (OMSP)..................................................................81
Terminology.....................................................................................................................81
Channel ....................................................................................................................81
Sensor ......................................................................................................................81
Gage.........................................................................................................................81

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Segment Vector ........................................................................................................82
Streaming Connection.....................................................................................................82
Message Types...............................................................................................................82
Metadata Messages........................................................................................................83
Contents ...................................................................................................................83
Example....................................................................................................................86
Measurement Message...................................................................................................87
Contents ...................................................................................................................87
Example....................................................................................................................89
Tare Message .................................................................................................................89
Contents ...................................................................................................................89
Example....................................................................................................................91
Receiving Messages Across TCP Packets......................................................................91
9 Additional Information ............................................................................................................92
Sensing Results near the Fiber Termination....................................................................92
System Operation Guidelines..........................................................................................93
Vibration Tolerance .........................................................................................................93
Test Setup.................................................................................................................93
Strain Test Setup ......................................................................................................93
Troubleshooting Dropouts.........................................................................................93
General Troubleshooting...........................................................................................95
10 Product Support Contact Information ...................................................................................98

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1Glossary
Term
Definition
Channel
A port on the front panel of the ODiSI instrument. There is a
maximum of 8 channels on an ODiSI.
Configuration
A set of Luna defined hardware and software parameters that
change the measurement capabilities of the ODiSI instrument.
Measurement parameters that change between configurations
include (but are not limited to): measurement rate, maximum
sensor length, and gage pitch. The ODiSI software
automatically selects the fastest measurement rate based on
the maximum sensor length detected and user-selected Gage
Pitch.
Gage
Subset of a fiber sensor that is used to make a single strain or
temperature measurement. A fiber sensor is divided into
numerous gages which provide distributed measurements of
strain or temperature along the fiber.
Gage Pitch
Length of fiber between the center of a single gage and the
center of a neighboring gage.
High-Definition
(HD) Sensor
A fiber sensor that provides a unique Rayleigh scatter signature
that the ODiSI instrument can use to make distributed strain or
temperature measurements.
Measurement
Rate
This is the rate (in Hz) at which the ODiSI provides strain or
temperature measurements.
ODiSI
Measurement
Streaming
Protocol (OMSP)
JSON based protocol for the transfer of ODiSI strain or
temperature data to another PC.
Sensor
Key/Reference
Data set containing the unique Rayleigh scatter pattern of a
single fiber sensor. This is compared to measurement scans to
calculate strain or temperature. When a sensor is rekeyed, a
new reference data set is captured. Once installed or
generated, these files are stored in the Sensor Repository on
the ODiSI controller.
Standard Length
Remote Module
Supports sensor lengths from 1 m to 20 m.
Extended Length
Remote Module
Supports sensor lengths from 1 m to 50 m.
RLC
Ruggedized LC connector. These connectors are used for the
connections between the standoff cable and ODiSI instrument
as well as between the standoff cable and the remote module.

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Segment
A collection of Gages defined by a Start Gage and an End
Gage.
Sensor (Strain)
A fiber optic cable sensitive to strain.
Sensor (CFG)
Continuous Fiber Grating (CFG) fiber sensor sold by Luna.
Rather than utilizing the intrinsic Rayleigh backscattering of the
fiber, fiber Bragg gratings are written into the fiber and utilized
by the ODiSI system to make distributed measurements.
Sensor
(Temperature)
A fiber optic cable sensitive to temperature.
Sensor
(SC Temperature)
A fiber optic cable sensitive to temperature with strain
compensation.
Sensor Length
Length of the sensing region of the fiber optic sensor.
Sensor
Repository
Directory on the ODiSI controller that contains sensor specific
data such as reference files, Tares, and Gage and Segment
definitions. Installing and uninstalling sensors adds or removes
this sensor data.
Standoff Cable
Length of optical fiber placed between the ODiSI instrument
and the remote module. This length does not count toward the
system’s sensor length. The ODiSI instrument can be used with
several different standoff cable lengths with RLC connectors on
each end: 10 m, 50 m, 100 m, 150 m, and 200 m. The longer
lengths can be achieved by connecting two shorter standoff
cables together using a Luna provided connector.
Strain
Coefficients
Polynomial coefficients used to accurately scale optical
frequency measurements into strain. These coefficients can
vary between sensors and are calibrated at the factory.
Temperature
Coefficients
Polynomial coefficients used to accurately scale optical
frequency measurements into temperature. These coefficients
can vary between sensors and are calibrated at the factory.
Test Data
Binary file containing measurement data from an ODiSI.
Time Stamp
The time at which a raw (optical) data acquisition was collected
by the ODiSI instrument. Time stamps are always with
reference to UTC.
Touch to Locate
The process of sequentially identifying individual Gage
locations using a hot or cold input.
TSV File
Tab separated value data file containing measurement data
from an ODiSI.

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2Safety
The advisory words Danger, Warning and Caution used in this manual identify the level of
hazard that may be encountered by the user.
•DANGER means if the danger is not avoided, it will cause death or serious injury.
•WARNING means if the warning is not heeded, it can cause death or serious injury.
•CAUTION means if the precaution is not taken, it may cause minor or moderate injury.
Warning
The protection provided by the equipment may be impaired if the equipment is used in a
manner not specified by the manufacturer, resulting in serious injury or death.
The power cord is the main electrical disconnect for this equipment. If it is necessary to ensure
no power to the unit, remove the power cord.
The use of controls, adjustments, performance, or procedures other than those specified
herein may result in hazardous laser radiation exposure and one or more safety protections
may be impaired or rendered ineffective.
Attention
La protection fournie par l'équipement peut être compromise si l'équipement est utilisé d'une
manière non spécifiée par le fabricant, entraînant des blessures graves ou la mort.
Le cordon d'alimentation est le principal disjoncteur électrique de cet équipement. S'il est
nécessaire de ne pas mettre l'appareil hors tension, retirez le cordon d'alimentation.
L'utilisation de commandes, d'ajustements, de performances ou de procédures autres que
celles spécifiées ici peut entraîner une exposition dangereuse au rayonnement laser et une
ou plusieurs protections de sécurité peuvent être altérées ou rendues inefficaces.
3System Overview
Luna Innovations’ Optical Distributed Sensor Interrogator (ODiSI 6) is a strain and
temperature measurement system designed to meet the needs of engineers and scientists
who are performing material characterization, process control, structural testing, and service
life monitoring of vehicles, components, power systems, and a variety of other applications.
The ODiSI employs an optical frequency domain reflectometry (OFDR) technique to interpret
the signal from fiber optic sensors to make strain and temperature measurements on a test
article.

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The ODiSI’s fiber optic sensors range from 1 m to 100 m in length for distributed strain
measurements and 1 m to 5 m for temperature measurements. Optical fiber’s flexibility and
small diameter (< 0.2 mm) lends itself to being located and routed through and inside parts
and locations not typically accessible with foil gages and thermocouples.
Because optical fibers undergo well defined local optical changes as a result of changes in
strain and temperature, the ODiSI is able to interpret the reflected signal along a sensor into
independent strain or temperature measurements throughout the length of the fiber at
intervals as low as 0.65 mm.
Figure 3-1 ODiSI sensor fiber.
ODiSI Instrument Specifications
The ODiSI platform is available in several channel configurations. Channels are sampled
serially at the maximum allowable data rate for thespecific sensor length and number of active
channels. Both temperature (not SCTemperature) and strain sensors canbe used on different
channels during the same test. A test with SC Temperature sensors cannot contain other
sensor types. A test with Luna CFG sensors cannot contain other sensor types.
The table below outlines the performance specifications for different configurations. Further
details can be found in the product data sheet, which is available on the Luna website
(www.lunainc.com).

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This User’s Guide uses examples and graphics from a setup with multiple sensors. It is
important to note, however, that whether the system is set up for one or multiple sensors, the
hardware setup and the application interface remain consistent.

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Hardware and Physical Setup
The ODiSI 6 system is shipped with the following key components:
Optical Distributed Sensor Interrogator (ODiSI 6)
Dedicated Instrument Controller
Standoff Cable(s)
Remote Module(s)
Optical Fiber Bulkhead
Cleaners
Optical Fiber Connector
Cleaner
Flash drive with user guides
and recovery software
ODiSI Power Cord
Laptop Power Adapter
USB3 Type A to B cable
Assembly
1. Remove all the components from the packaging and verify that the components are
undamaged.
2. Place the unit on a stable surface capable of supporting the entire weight of the unit.
3. Confirm that airflow into and out of the vents at the side and rear of the unit is not
obstructed.

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4. Clean the duplex LC-APC connectors at the ends of the standoff cable using the
provided Cletop connector cleaner (see Setup Guide for cleaning instructions).
5. Connect one end of the standoff cable to one of the front panel ports on the ODiSI.
6. Connect the other end of the standoff cable to the remote module.
Note: Repeat steps 5 and 6 for each remote module that came with the configuration.
7. Unpack and set up the instrument controller (laptop) according to the manufacturer’s
instructions.
8. Connect the ODiSI 6 to the controller using the supplied USB 3.1 Gen I cable.
9. Attach the power cords to the controller and ODiSI 6.
10. Turn on the ODiSI 6 and the instrument controller (laptop).
Note: The ODiSI 6 can be restarted without restarting the laptop.
11. Log into the laptop using the following credentials:
User Name: odisi
Password: odisi
12. Launch the ODiSI software by double clicking on the OD6 desktop icon.

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4Software Overview
Figure 4-1: Main screen of the user software
This chapter provides an overview of the functionalities available in the ODiSI 6 user software.
Instructions for how to quickly set up a test and log data are found in the next chapter
(Software Quick Start Guide). Following that is a detailed explanation of all the ODiSI 6
software functionalities (Using the ODiSI 6 Software).
The functionalities provided by the software relate to the following main actions:
1. Configure operational parameters
2. Install sensors
3. View and evaluate sensor performance
4. Set up the ODiSI for data logging
5. Run a test
6. View test data
Operational Parameters
When the software is first launched, the software will go through an initialization process.
Once completed, the main user interface will be displayed, showing the status of the system
as well as each channel on the ODiSI. Other information on display in the main software
interface includethe measurement modeof the system, thegage pitch, the performance mode
of the system, the associated per channel measurement rate, and the loaded test
configuration as well as the sensor types connected on each channel.

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Manage the Sensor Repository
The ODiSI is configured for use with Luna’s fiber optic strain and temperature sensors. Each
sensor has a unique optical signature which is used to
1. Characterize the sensor’s strain or temperature state, and
2. Automatically identify the sensor (for most Luna fiber sensor types).
This reference file is also called a sensor key and is contained in Luna-labeled flash drives
shipped with each sensor. In order for an ODiSI to make measurements from a sensor, that
sensor’s key needs to be installed onto the controller prior to use. Once installed, these files
are stored in the Sensor Repository on the controller.
Actions related to installing sensors and managing the Sensor Repository can be accessed
from the “Tools →Manager Sensors”menu. These actions include installing sensors,
renaming sensors, deactivating sensors, deleting deactivated sensors, andexporting sensors.
For more information, see Manage the Sensor Repository.
View and Evaluate Sensor Status
Once a sensor is identified and added to a particular Channel’s configuration, its performance
can be viewed for evaluation by clicking the associated “View” button. The
subsequent interface provides a look at the strain or temperature profile along the sensor.
Other actions that can be accessed from this interface include creating and selecting a Tare,
defining individual gages and segments for data logging and streaming, as well as Rekeying
the sensor.
Set Up the ODiSI for Data Logging
Once satisfied with the sensor performance on each channel, the ODiSI can be set up for
logging test data. Data logging rates, trigger settings, as well as data streaming settings are
accessed through the Settings menu. The test naming is accessed through the “File →Set
Test Data File Save Options” menu.
Run a Test
Clicking on the “Arm” button prepares the ODiSI for running a test. This
will initially display the Sensor Plot screen.

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Figure 4-2: Arming a test shows the Sensor Plot screen
When a test is running,the Sensor Plot and GagePlot visualizations are available. The Sensor
Plot allows viewing of the strain or temperature along all sensors, and the “Gage Plot”allows
viewing strain or temperature measurements from select individual gage locations along all
sensors, over time.
View Test Data
Test data is logged in binary files that are stored in the Test Data folder on the controller. Test
data can be played back through the “Play Back Test Data”function and can be converted to
human readable tab delimited .tsv files through the “Generate Test Data TSV Files”function.
These TSV files can be opened in external programs such as Excel or Matlab for further data
analysis.
5Software Quick Start Guide
This chapter quickly goes through the process of setting up a single channel ODiSI test with
test data file logging enabled. The test data file is then opened for playback afterwards.
Operational Parameters
1. Launch the software.
a. Double click the “OD6” desktop shortcut. The application window will display
an “Initializing”status. Once this reaches 100%, the main software interface is
active.
2. Check that the “Status”is updated to “Ready”.

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Figure 5-1: Main screen of the user software after successful initialization, status field shows “Ready”
Installing a Sensor
1. Install a sensor.
a. Plug the flash drive containing the sensor key into a USB port of the ODiSI
controller.
b. Open the menu by clicking the button in the top-left corner.
c. Click on “Tools →Manager Sensors”to bring up the Manage Sensor Dialog
as show in the figure.

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Figure 5-2: Manage Sensors menu item
d. Click on the “Install Sensor” button.
e. Navigate to where the sensor key is located, select it and click the “Open”
button.
f. Click “Close”to exit the “Manager Sensors” window.
Figure 5-3: Manager Sensors window with Install Sensor dialog
View and Evaluate Sensor Status
1. Add the identified sensor to the channel configuration. Do this by clicking the
button beside the identified sensor.

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2. For the ODiSI 6100 Series, measurements can be taken with the 1.3 mm Gage
Pitch. To change the gage pitch, select the “Settings →General” menu item to open
the “General Settings” dialog and then choose “1.3 mm” from the Gage Pitch drop-
down. For the ODiSI 6000 Series, choose “5.2 mm” from the Gage Pitch drop-down.
Figure 5-4: General Settings menu item
Figure 5-5: General Settings dialog
3. Click on the “View” button.
Figure 5-6: Added identified sensor to test configuration on channel 1, View button enabled
4. Click the “Fit Plot”button to auto-scale the measurement vs. length plot.

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Figure 5-7: View strain along the length of the sensor
5. Confirm that the measurement length matches the expected sensor length.
6. Zero out residual strains along the sensor. Click on the “Save Tare”
button and give the Tare a name.
7. Define additional Gages and Segments using Touch to Locate.
a. Click on the “Start Touch to Locate”button.
b. Apply a localized hot or cold touch to the sensor at the gage location of interest.
c. A red vertical cursor will appear at the touch location.
d. Click the “Add Gage”button.
e. Repeat the above steps for other gages of interest.

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Figure 5-8: Define Gages and Segments
Set Up the ODiSI for Data Logging
1. Set up test data file saving.
a. Ensure “Save Test”is checked.
Figure 5-9: Check the "Save Test" checkbox
b. Click on “File → Set Test Data File Save Options” to specify the test name,
notes and destination folder.
Figure 5-10: Menu item for test data file saving options